adding the four "tool" icons to bind into the executable (this works for now)

src/Makefile

@@ -4,7 +4,8 @@ SPLASHSCREEN=splash-vmwcblk.png
 
 OBJS=main.o sysinput.o ep_init.o ep_upiwin.o ep_backlight.o ep_msg.o ep_graphics.o ep_devctxt.o ep_bitmap.o \
      ep_upiwin_tmp.o ep_util.o fbinit.o rect.o gfxobj.o devctxt.o dc_screen.o fontengine.o \
-	 bitmap.o fbprimitive.o log.o gpio.o msg_queue.o time_func.o config.o splash.o
+	 bitmap.o fbprimitive.o log.o gpio.o msg_queue.o time_func.o config.o \
+	 i_freehand.o i_line.o i_rect.o i_fillrect.o splash.o
 LIBS=-lpython3.7m -lcrypt -lfreetype -lbcm2835 -lpthread -ldl -lutil -lm
 CFLAGS=-I/usr/include/python3.7m -I/usr/include/freetype2 -I/usr/include/libpng16 \
        -Wall -Werror -fstack-protector -fwrapv -fno-PIE -g -O3 -DDEBUG_ASSERT
@@ -19,12 +20,24 @@ upiwin: $(OBJS)
 .c.o:
 	gcc -c $(CFLAGS) $<
 
-splash.o: splash.bin
+.bin.o:
 	objcopy -I binary -O elf32-littlearm -B arm --rename-section \
-		.data=.rodata,alloc,load,readonly,data,contents splash.bin splash.o
+		.data=.rodata,alloc,load,readonly,data,contents $< $@
 
 splash.bin: $(RESOURCES)/$(SPLASHSCREEN) $(BUILDUTILS)/mkgfx
 	$(BUILDUTILS)/mkgfx $(RESOURCES)/$(SPLASHSCREEN) splash.bin
 
+i_freehand.bin: $(RESOURCES)/i_freehand.png $(BUILDUTILS)/mkgfx
+	$(BUILDUTILS)/mkgfx $(RESOURCES)/i_freehand.png i_freehand.bin
+
+i_line.bin: $(RESOURCES)/i_line.png $(BUILDUTILS)/mkgfx
+	$(BUILDUTILS)/mkgfx $(RESOURCES)/i_line.png i_line.bin
+
+i_rect.bin: $(RESOURCES)/i_rect.png $(BUILDUTILS)/mkgfx
+	$(BUILDUTILS)/mkgfx $(RESOURCES)/i_rect.png i_rect.bin
+
+i_fillrect.bin: $(RESOURCES)/i_fillrect.png $(BUILDUTILS)/mkgfx
+	$(BUILDUTILS)/mkgfx $(RESOURCES)/i_fillrect.png i_fillrect.bin
+
 clean:
 	rm -f upiwin *.o splash.bin *~